Catalysts for olefin polymerization

ABSTRACT

Selected nickel complexes of the anions of certain 2-aminotropones are olefin polymerization catalysts. Novel 2-aminotropones and their nickel complexes are also disclosed together with methods of making these 2-aminotropones.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority under 35 U.S.C. §119 from U.S. Provisional Application Ser. No. 60/161,237 (filed Oct. 22, 1999), which is incorporated by reference herein for all purposes as if fully set forth.

FIELD OF THE INVENTION

This invention concerns new processes for the polymerization of olefins using as a polymerization catalyst a nickel complex of certain 2-aminotropones. Also described are novel compounds that are the complexes and intermediates for making the complexes, as well as processes for producing such compounds.

TECHNICAL BACKGROUND

Polymers of ethylene and other olefins are important items of commerce, and these polymers are used in a myriad of ways, from low molecular weight polyolefins being used as a lubricant and in waxes, to higher molecular weight grades being used for fiber, films, molding resins, elastomers, etc. In most cases, olefins are polymerized using a catalyst, often a transition metal compound or complex. These catalysts vary in cost per unit weight of polymer produced, the structure of the polymer produced, the possible need to remove the catalyst from the polyolefin, the toxicity of the catalyst, etc. Due to the commercial importance of polymerizing olefins, new polymerization catalysts are constantly being sought.

Arylaminotropones are useful as chemical intermediates, for instance in the synthesis of pharmaceuticals and pesticides.

Nickel complexes of various neutral ligands and monoanionic ligands are known as catalysts for the polymerization of ethylene and other olefins, see for instance (for monoanionic ligands) U.S. Pat. No. 6,060,569, WO9830609 (corresponding to U.S. patent application Ser. No. 09/006536, filed Jan. 13, 1998) and WO9842664, which are incorporated by reference herein for all purposes as if fully set forth. None of these references describe the use of aminotropones as ligands for nickel containing olefin polymerization catalysts.

Anilinotropones, especially 2-anilinotropones, have been made by a variety of methods, see for instance K. Kikuchi, Bull. Chem. Soc. Jpn., vol. 51, p. 2338 (1978); T. Nozoe, Bull. Chem. Soc. Jpn., vol. 51, p. 2185 (1978); and W. R. Brasen, J. Am. Chem. Soc., vol. 83, p. 3125 (1961). The methods described in these references are different from the methods described herein. In addition, yields of the desired 2-anilinotropones are generally lower than reported herein, and/or sterically hindered less basic arylamines are not used in the synthesis thereof.

SUMMARY OF THE INVENTION

One aspect of the present invention concerns a first process for the polymerization of olefins, comprising the step of contacting, at a temperature of about −100° C. to about +200° C., one or more olefins with an active catalyst comprising a nickel complex of an anion of the formula

wherein:

R²is hydrocarbyl or substituted hydrocarbyl, provided that R² is attached to said nitrogen atom in (I) by an atom that has at least 2 other atoms that are not hydrogen attached to it; and

R³, R⁴, R⁵, R6 and R⁷ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group, provided that any two of R³, R⁴, R⁵, R⁶ and R⁷ vicinal to one another may form a ring.

Another aspect of the present invention concerns a second process for the polymerization of olefins, comprising the step of contacting, at a temperature of about −100° C. to about +200° C., one or more olefins with a compound of the formula

wherein:

R² is hydrocarbyl or substituted hydrocarbyl, provided that R² is attached to said nitrogen atom in (I) by an atom that has at least 2 other atoms that are not hydrogen attached to it;

R³, R⁴, R⁵, R⁶ and R⁷ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group, provided that any two of R³, R⁴, R⁵, R⁶ and R⁷ vicinal to one another may form a ring;

L¹ is a monodentate monoanionic ligand into which an olefin molecule may insert between L¹ and the nickel atom, and L² is an empty coordination site or a monodentate neutral ligand which may be displaced by an olef in, or L¹ and L² taken together are a monoanionic bidentate ligand into which an olefin may insert between said monoanionic bidentate ligand and the nickel atom;

and provided that when L¹ and L² taken together are

then a cocatalyst is also present.

In the above-mentioned processes, (II) and/or the nickel complex of (I) may in and of themselves be active catalysts, or may be “activated” by contact with a cocatalyst/activator, as exemplified by the case when L¹ and L² taken together are (I).

The present invention also concerns a compound of the formula

wherein:

R² is hydrocarbyl or substituted hydrocarbyl, provided that R² is attached to said nitrogen atom in (I) by an atom that has at least 2 other atoms that are not hydrogen attached to it; and

R³, R⁴, R⁵, R⁶ and R⁷ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group, provided that any two of R³, R⁴, R⁵, R⁶ and R⁷ vicinal to one another may form a ring;

L¹ is a monodentate monoanionic ligand, and L² is a monodentate neutral ligand or an empty coordination site, or L¹ and L² taken together are a monoanionic bidentate ligand.

Another aspect of the present invention is a process for making 2-arylamino substituted tropones, comprising the step of contacting, in solution at a temperature of about 20° C. to about 150° C., a first compound of the formula

a second compound of the formula HNR⁹R⁹ (IV), a palladium compound, a base capable of deprotonating said second compound, and a third compound which is a mono- or diphosphine in which all of the bonds to phosphorous are to carbon atoms, wherein:

R³, R⁴, R⁵, R⁶ and R⁷ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group, provided that any two of R³, R⁴, R⁵, R⁶ and R⁷ vicinal to one another may form a ring;

R⁸ is a group such that the conjugate acid of —OR⁸ has a pKa of <0 in water at 20° C.;

R¹⁹ is hydrocarbyl, substituted hydrocarbyl or hydrogen; and

R⁹ is aryl or substituted aryl.

Still another aspect of the present invention is a compound of the formula

wherein:

R³, R⁴, R⁵, R⁶ and R⁷ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group, provided that any two of R³, R⁴, R⁵, R⁶ and R⁷ vicinal to one another may form a ring; and

R¹¹, R¹², R¹³, R¹⁴ and R¹⁵ are each independently hydrogen, hydrocarbyl substituted hydrocarbyl or a functional group, provided that any two of R¹¹, R¹², R¹³, R¹⁴ and R¹⁵ vicinal to one another taken together may form a ring; provided that:

-   -   both of R¹¹ and R¹⁵ are not hydrogen; and/or the total of the         Hammett σ constants for R¹¹, R², R¹³,     -   R¹⁴ and R¹⁵ is about 0.50 or more; and/or an E_(s) for one or         both of R¹¹ and R¹⁵ is −0.10 or less.

A further aspect of the present invention is an anion of the formula

wherein:

R² is hydrocarbyl or substituted hydrocarbyl, provided that R² is attached to said nitrogen atom in (I) by an atom that has at least 2 other atoms that are not hydrogen attached to it; and

R³, R⁴, R⁵, R⁶ and R⁷ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group, provided that any two of R³, R⁴, R⁵, R⁶ and R⁷ vicinal to one another may form a ring.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Herein, certain terms are used. Some of them are:

A “hydrocarbyl group” is a univalent group containing only carbon and hydrogen. As examples of hydrocarbyls may be mentioned unsubstituted alkyls, cycloalkyls and aryls. If not otherwise stated, it is preferred that hydrocarbyl groups herein contain 1 to about 30 carbon atoms.

By “substituted hydrocarbyl” herein is meant a hydrocarbyl group that contains one or more substituent groups which are inert under the process conditions to which the compound containing these groups is subjected. The substituent groups also do not substantially interfere with the process. If not otherwise stated, it is preferred that substituted hydrocarbyl groups herein contain 1 to about 30 carbon atoms. Included in the meaning of “substituted” are heteroaromatic rings. When a heteroaromatic ring is present, it may be attached to another group through the heteroatom. In substituted hydrocarbyl all of the hydrogens may be substituted, as in trifluoromethyl.

By “(inert) functional group” herein is meant a group other than hydrocarbyl or substituted hydrocarbyl which is inert under the process conditions to which the compound containing the group is subjected. The functional groups also do not substantially interfere with any process described herein that the compound in which they are present may take part in. Examples of functional groups include halo (fluoro, chloro, bromo and iodo), ether such as —OR²² wherein R²² is hydrocarbyl or substituted hydrocarbyl. In cases in which the functional group may be near a nickel atom the functional group should not coordinate to the metal atom more strongly than the groups in those compounds are shown as coordinating to the metal atom, that is they should not displace the desired coordinating group.

By “olefin” is meant a compound containing one or more olefinic double bonds. In the event that the compound contains more than one olefinic double bond, they should be non-conjugated. As examples of olefins may be mentioned cyclopentene, a styrene, a norbornene, and compounds of the formulas R¹⁷CH═CH₂ wherein R¹⁷ is hydrogen or alkyl.

By an oligomerization or polymerization “co-catalyst” or “catalyst activator” is meant a compound that reacts with a transition metal compound to form an activated catalyst species. A preferred catalyst activator is an “alkyl aluminum compound”, that is, a compound which has at least one alkyl group bound to an aluminum atom. Other groups such as alkoxide, hydride, and halogen may also be bound to aluminum atoms in the compound.

By “neutral Lewis base” is meant a compound, which is not an ion, that can act as a Lewis base. Examples of such compounds include ethers, amines, sulfides, and organic nitriles.

By “neutral Lewis acid” is meant a compound, which is not an ion, that can act as a Lewis acid. Examples of such compounds include boranes, alkylaluminum compounds, aluminum halides, and antimony [V] halides.

By “cationic Lewis acid” is meant a cation that can act as a Lewis acid. Examples of such cations are sodium and silver cations.

By an “empty coordination site” is meant a potential coordination site on a metal atom that does not have a ligand bound to it. Thus if an olefin molecule (such as an ethylene molecule) is in the proximity of the empty coordination site, the olefin molecule may coordinate to the metal atom.

By a “ligand into which an olefin molecule may insert” between the ligand and a nickel atom is meant a ligand coordinated to the nickel atom into which an olefin molecule or a coordinated olefin molecule (such as an ethylene molecule or a coordinated ethylene molecule) may insert to start or continue a polymerization. For instance, this may take the form of the reaction (wherein L is a ligand):

By a “ligand which may be displaced by an olefin” is meant a ligand coordinated to a transition metal, which when exposed to an olefin (such as ethylene) is displaced as the ligand by the olefin.

By a “monoanionic ligand” is meant a ligand with one negative charge.

By a “neutral ligand” is meant a ligand that is not charged.

“Alkyl group” and “substituted alkyl group” have their usual meaning (see above for substituted under substituted hydrocarbyl). Unless otherwise stated, alkyl groups and substituted alkyl groups preferably have 1 to about 30 carbon atoms.

By a “styrene” herein is meant a compound of the formula

wherein R⁴³, R⁴⁴, R⁴⁵, R⁴⁶ and R⁴⁷ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group, all of which are inert in the polymerization process. It is preferred that all of R⁴³, R⁴⁴, R⁴⁵, R⁴⁶ and R⁴⁷ are hydrogen. Styrene (itself) is a preferred styrene.

By a “norbornene” is meant ethylidene norbornene, dicyclopentadiene, or a compound of the formula

wherein R⁴⁰ is hydrogen or hydrocarbyl containing 1 to 20 carbon atoms. It is preferred that R⁴⁰ is hydrogen or alkyl, more preferably hydrogen or n-alkyl, and especially preferably hydrogen. The norbornene may be substituted by one or more hydrocarbyl, substituted hydrocarbyl or functional groups in the R⁴⁰ or other positions, with the exception of the vinylic hydrogens, which remain. Norbornene (itself), dimethyl endo-norbornene-2,3-dicarboxylate, t-butyl 5-norbornene-2-carobxylate are preferred norbornenes and norbornene (itself) is especially preferred.

By a “π-allyl group” is meant a monoanionic ligand with 3 adjacent sp² carbon atoms bound to a metal center in an η³ fashion. The three sp² carbon atoms may be substituted with other hydrocarbyl groups or functional groups.

By “aryl” is meant a monovalent aromatic group in which the free valence is to the carbon atom of an aromatic ring. An aryl may have one or more aromatic rings which may be fused, connected by single bonds or other groups.

By “substituted aryl” is meant a monovalent aromatic group substituted as set forth in the above definition of “substituted hydrocarbyl”. Similar to an aryl, a substituted aryl may have one or more aromatic rings which may be fused, connected by single bonds or other groups; however, when the substituted aryl has a heteroaromatic ring, the free valence in the substituted aryl group can be to a heteroatom (such as nitrogen) of the heteroaromatic ring instead of a carbon.

The polymerizations herein are carried out by a nickel complex of anion (I). In (I), and in all complexes and compounds containing (I) or its parent conjugate acid, it is preferred that:

R³, R⁴, R⁵, R⁶ and R⁷ are all hydrogen; and/or

R²is aryl or substituted aryl, especially phenyl or substituted phenyl.

Useful groups for R² include, for example

which may be substituted in any or all of their ring positions. It is preferred that at least one position next to (ortho) the free valence of the aryl ring be substituted, and more preferred that both of these positions be substituted. In particular it is more preferred that R² is

wherein each of R¹¹, R¹², R¹³, R¹⁴ and R¹⁵ are independently hydrogen, hydrocarbyl substituted hydrocarbyl or a functional group, provided that any two of R¹¹, R¹², R¹³, R¹⁴ and R¹⁵ vicinal to one another taken together may form a ring. In one particularly preferred form both R¹¹ and R¹⁵ are not hydrogen, and/or R¹², R¹³ and R¹⁴ are hydrogen. In another preferred form R¹¹ and R¹⁵ are each independently chosen from the group consisting of alkyl containing 1 to 6 carbon atoms, perfluoroalkyl, alkoxy, phenyl and halo, more preferably alkyl containing 1 to 4 carbon atoms, phenyl and halo. Particularly preferred are when R¹¹ and R¹³ are both ipropyl or phenyl, or when R¹¹ is methyl and R¹⁵ is trifluoromethyl. Preferred specific groups (VI) are shown in Table 1.

TABLE 1 R¹¹ R¹² R¹³ R¹⁴ R¹⁵ Me H H H Me IPr H H H iPr TBu H H H H TBu H H H Me Cl H H H Cl Br H H H Br F F F F F H CF₃ H CF₃ H Ph H H H Ph F H H H F

All of the complexes of (I) can be made from the corresponding tropone

In turn (VII) can be made by the process described below, using a palladium catalyst in the presence of a phosphine compound.

In a process to make (VII) the appropriately substituted arylamine, (IV) (and preferred substitution is the same as in (I)), is reacted with an appropriately substituted tropone ester (and preferred substitution is as in (I)), in the presence of a base, a palladium compound and a mono- or diphosphine. This reaction is carried out in solution, although not all of the ingredients must be totally soluble at all times, all of the starting materials, except the base, should be at least somewhat soluble. Preferred solvents are relatively inert to all of the ingredients and products, and include hydrocarbon solvents such as toluene, and ethers such as 1,4-dioxane, ethyl ether and tetrahydrofuran.

The palladium compound may be a Pd[II] compound or a Pd[0] compound, such as palladium acetate, PdX₂ wherein each X is independently halogen, and palladium bis(dibenzylideneacetone), which is preferred. The phosphine may be a mono- or diphosphine in which all three of the bonds to phosphorous are to separate carbon atoms. It is preferred that the phosphine be somewhat sterically hindered. Useful phosphines include (o-tolyl)₃P, (t-Bu)₃P, 1,1′-bis(diphenylphosphino)ferrocene, bis(2-diphenylphosphinophenyl)ether, 2-(di-t-butylphosphino)biphenyl, 2-(dicylohexylphosphino)biphenyl, and

wherein each R¹⁰ is independently aryl or substituted aryl and preferably all of R¹⁰ are phenyl (this compound is sometimes abbreviated “BINAP”). A preferred phosphine is (XI).

The base may be any metal salt, preferably an alkali metal salt, which can serve as an acceptor for the proton liberated from the arylamine during the process. The base should have at least sparing solubility in the process solvent. Useful bases include alkali metal carbonates such as cesium carbonate, alkali metal phosphates such as potassium phosphate (K₃PO₄), alkali metal alkoxides such as potassium t-butoxide, and alkali metal amides such as sodium hexamethyldisilamide.

In the process to make (VII) ratios of the various ingredients are not critical, but to make efficient and economical use of the various ingredients, it is preferred that:

the molar ratio of (III):(IV) is about 0.1 to about 1.0, more preferably about 0.8 to about 0.9;

the amount of gram-atoms of palladium (in whatever form the Pd is added) is about 0.01 to about 10 percent of the number of moles of tropone, more preferably about 0.5 to 1.5 percent; and/or

the number of equivalents of base to moles of tropone is preferably about 1.0 to about 4.0, more preferably about 1.2 to about 1.6.

The process to make (VII) is preferably carried out at a temperature of about 20° C. to about 150° C., more preferably about 50° C. to about 120° C., and especially preferably about 70° C. to about 90° C. It is preferred to carry out the process in the absence of water (and other active hydrogen compounds) and oxygen, especially in the absence of oxygen. This is conveniently carried done by carrying out the process under an inert gas such as nitrogen or argon. The time required for this process is also not critical, 3 to 48 hours, more typically 12-15 hours, being useful ranges.

In the process to make (VII), (III) is one of the starting materials. In (III), R⁸ is a group such that the conjugated acid of R⁸O— has a pKa of <0. Useful groups for R⁸ include R¹⁶SO₂—, wherein R¹⁶ is perfluorohydrocarbyl, especially perfluoroalkyl, and p-tolyl. A preferred group for R⁸ is R¹⁶SO₂—, wherein R¹⁶ is perfluoroalkyl, especially trifluoromethyl (sometimes called the “triflate” group). (III) may be made by methods known in the art, for instance the preparation of 2-triflatotropone is found in A. M. Echavarren, et al., J. Am. Chem. Soc., vol. 110, p. 1557 (1988), which is included by reference herein.

The process to make (VII) (and hence (X)) herein produces these types of compounds in improved yields and/or allows the production of compounds which cannot be produced by simple nucleophilic displacements, for instance using aromatic amines (IV) in which the amine group is sterically hindered by substitution at one or both of the ortho positions, and/or the amine has reduced bascisity because the aromatic group bears electron withdrawing substituents.

In (IV) (and in any of the arylaminotropones subsequently produced) it is preferred that R¹⁹ is alkyl, substituted alkyl or hydrogen, more preferred that it is alkyl or hydrogen, and especially preferred that it is hydrogen.

The steric effect of various groupings has been quantified by a parameter called Es, see R. W. Taft, Jr., J. Am. Chem. Soc., vol. 74, p. 3120-3128 (1952), and M. S. Newman, Steric Effects in Organic Chemistry, John Wiley & Sons, New York, 1956, p. 598-603, both of which are hereby incorporated by reference herein for all purposes as if fully set forth. For the purposes herein, the Es values are those for o-substituted benzoates described in these publications. If the value for E_(S) for any particular group is not known, it can be determined by methods described in these publications. For the purposes herein, the value of hydrogen is defined to be the same as for methyl (0.00). Representative values for E_(S) are (taken from Table V in Taft and Series 2-2 through 2-10 in Newman) —OCH₃ +0.97, —Br +0.01, —I −0.20, CH₃CH₂— 0.07, CH₃CH₂CH₂— −0.36, i-C₃H₇— −0.47, t-C₄H₉— −1.54 C₆H₅— −0.90. In one preferred form of (X) the E_(s) for either of the ortho substituents is −0.10 or less, preferably about −0.25 or less, and especially preferably about −0.50 or less.

Another preferred form of (X) is when the phenyl ring has electron withdrawing groups attached to it. The electron withdrawing ability of various substituents may be measured by the Hammett constant, see for instance H. H. Jaffe, Chem. Rev., vol. 53, p. 191-261 (1953), especially Table 7, which is hereby included by reference. Since Hammett substituents constants are often not calculated for ortho substituents, for any ortho substituent the Hammett constant will be taken as the Hammett para constant (σ_(para)). The total of all the σ constants for all of the substituents on the phenyl ring is about 0.50 or more, more preferably about 0.75 or more.

It is also preferred in (I) (and in compounds in which it occurs) that provided that one or more of the following obtains: both of R¹¹ and R¹⁵ are not hydrogen; the total of the Hammett a constants for R¹¹, R¹², R¹³, R¹⁴ and R¹⁵ is about 0.50 or more; and an E_(s) for one or both of R¹¹ and R¹⁵ is −0.10 or less. The more preferred forms for (X) are also preferred in (I).

Herein (VII) may be converted to a nickel complex such as (II), and in turn (II) may be active in and of itself and thus useful directly as an olefin polymerization catalyst, or may be converted to an active polymerization catalyst by contact with one or more other compounds (so-called cocatalysts). Thus (VII) may be converted to its anion by reaction with a strong base such as sodium hydride, and this anion (which is actually (I)) may be reacted with an appropriate nickel compound to form (II). Useful nickel compounds include:

(Ph₃P)₂Ni(Ph)(Cl) (see Example 13) which gives (II) in which L¹ is Ph, and L² is Ph₃P;

(TMEDA)₂Ni(Ph)(Cl) in the presence of a “trapping ligand” L² such as pyridine, which specifically gives (IX) for instance in which L¹ is Ph, and L² is pyridine;

(Ph₃P)₂NiCl₂ which gives (II) in which L¹ is Cl, and L² is Ph₃P; and

((allyl)Ni(X))₂ which gives (II) in which L¹ and L² taken together are π-allyl.

Methods of synthesis of these types of nickel complexes may also be found in previously incorporated US6060569, WO98/30609 and WO98/42664, and R. H. Grubbs., et al., Organometallics, vol. 17, p. 3149 (1988), which is also incorporated by reference herein for all purposes as if fully set forth.

In (II) useful groups L¹ include halide (especially chloride), hydrocarbyl and substituted hydrocarbyl especially phenyl and alkyl and particularly phenyl, methyl, hydride and acyl. Useful groups for L² include phosphine such as triphenylphosphine, nitrile such as acetonitrile, ethers such as ethyl ether, pyridine, and tertiary alkylamines such as TMEDA (N,N,N′,N′-tetramethyl-1,2-ethylenediamine). Alternatively L¹ and L² taken together may be a π-allyl or π-benzyl group such as

wherein R is hydrocarbyl.

In (II) when an olefin (such as ethylene) may insert between L¹ and the nickel atom, and L² is an empty coordination site or is a ligand which may be displaced by an olefin (such as ethylene), or L¹ and L² taken together are a bidentate monoanionic ligand into which an olefin (such as ethylene) may be inserted between that ligand and the nickel atom, (II) may by itself catalyze the polymerization of an olefin. Examples of L¹ into which an olefin (and particularly ethylene) may insert between it an the nickel atom are hydrocarbyl and substituted hydrocarbyl especially phenyl and alkyl and particularly methyl, hydride and acyl, and ligands L² which an olefin (and particularly ethylene) may displace include phosphine such as triphenylphosphine, nitrile such as acetonitrile, ether such as ethyl ether, pyridine, and tertiary alkylamines such as TMEDA. Ligands in which L¹ and L² taken together are a bidentate monoanionic ligand into which an olefin (and particularly ethylene) may insert between that ligand and the nickel atom include π-allyl or π-benzyl-type ligands (in this instance, sometimes it may be necessary to add a neutral Lewis acid cocatalyst such as triphenylborane to initiate the polymerization, see for instance previously incorporated WO98/30609). For a summary of which ligands an olefin (and particularly ethylene) may insert into (between) the ligand and nickel atom) see for instance J. P. Collman, et al., Principles and Applications of Organotransition Metal Chemistry, University Science Book, Mill Valley, Calif., 1987, included herein by reference. If for instance L¹ is not a ligand into which an olefin (such as ethylene) may insert between it and the nickel atom, it may be possible to add a cocatalyst which may convert L¹ into a ligand which will undergo such an insertion. Thus if L¹ is halo such as chloride or bromide, or carboxylate, it may be converted to hydrocarbyl such as alkyl by use of a suitable alkylating agent such as an alkylaluminum compound, a Grignard reagent or an alkyllithium compound. It may be converted to hydride by used of a compound such as sodium borohydride.

In (II) when L¹ and L² taken together are (I), in the polymerizations a cocatalyst (sometimes also called an activator) which is an alkylating or hydriding agent is also present in the olefin polymerization. It is preferred however that L¹ and L² taken together are not (I). A preferred cocatalyst is an alkylaluminum compound, and particularly preferred are trialkylaluminum compound such as trimethylaluminum, triethylaluminum and tri-i-butylaluminum, and trimethylaluminum is especially preferred. More than one such cocatalyst may be used in combination.

In the polymerizations herein homo- or copolymers of the various olefins may be produced. A preferred olefin (or combination of olefins) is R¹⁷CH═CH₂ wherein R¹⁷ is hydrogen or n-alkyl containing 1 to 15 carbon atoms, and especially preferred is when R¹⁷ is hydrogen or methyl (ethylene or propylene, respectively), and more preferred is when R¹⁷ is hydrogen (ethylene).

In the polymerization processes herein, the temperature at which the polymerization is carried out is about −100° C. to about +200° C., preferably about −60° C. to about 150° C., more preferably about −20° C. to about 100° C. The pressure of the olefin (if it is a gas) at which the polymerization is carried out is not critical, atmospheric pressure to about 275 MPa being a suitable range. Generally speaking the response of the catalyst, and hence the polymer produced, to the effects of temperature and pressure are similar to other nickel catalysts, see for instance U.S. Pat. No. 5,880,241 (incorporated by reference herein for all purposes as if fully set forth). As shown in Table 3 as the temperature increases catalyst productivity increases until about 80° C. (at least under these particular polymerization conditions and this catalyst) and then starts decreasing, and the branching level increases as the temperature increases. Up to a point at least, increasing the ethylene pressure (Table 4) increases catalyst productivity, decreases branching, and increases polymer molecular weight. It is also believed that as the ethylene pressure increases, it becomes more important that the ethylene used be of high purity. The effect of catalyst loading (Table 5) is somewhat uncertain since in Example 54 there was a large exotherm.

The polymerization processes herein may be run in the presence of various liquids, particularly aprotic organic liquids. The catalyst system, monomer(s), and polymer may be soluble or insoluble in these liquids, but obviously these liquids should not prevent the polymerization from occurring Suitable liquids include alkanes, cycloalkanes, selected halogenated hydrocarbons and aromatic hydrocarbons. Specific useful solvents include hexane, toluene, benzene, chlorobenzene, tetrahydrofuran, methylene chloride and 1,2,4-trichlorobenzene. The effects of various solvents on the polymerizations are shown in Table 7.

Various polar compounds such as ethyl acetate, triethylamine, water and ethanol may be present in the polymerization, although in some instances the yields may be reduced (see Table 6). The polymerization may also be carried out in the presence of air. It is noted that the polymerization proceeds with some of these additives even though they may contain active hydrogen atoms (water, ethanol).

The olefin polymerizations herein may also initially be carried out in the “solid state” by, for instance, supporting the nickel compound on a substrate such as silica or alumina, activating if necessary it with one or more cocatalysts and contacting it with the olefin(s). Alternatively, the support may first be contacted (reacted) with a cocatalyst (if needed) such as an alkylaluminum compound, and then contacted with an appropriate Ni compound. The support may also be able to take the place of a Lewis or Bronsted acid, for instance, an acidic clay such as montmorillonite, if needed. Another method of making a supported catalyst is to start a polymerization or at least make a nickel complex of another olefin or oligomer of an olefin such as cyclopentene on a support such as silica or alumina. These “heterogeneous” catalysts may be used to catalyze polymerization in the gas phase or the liquid phase. By gas phase is meant that a gaseous olefin is transported to contact with the catalyst particle.

In all of the polymerization processes described herein oligomers and polymers of the various olefins are made. They may range in molecular weight from oligomeric olefins, to lower molecular weight oils and waxes, to higher molecular weight polyolefins. One preferred product is a polymer with a degree of polymerization (DP) of about 10 or more, preferably about 40 or more. By “DP” is meant the average number of repeat (monomer) units in a polymer molecule.

Depending on their properties, the polymers made by the processes described herein are useful in many ways. For instance if they are thermoplastics, they may be used as molding resins, for extrusion, films, etc. If they are elastomeric, they may be used as elastomers. If they contain functionalized monomers such as acrylate esters, they are useful for other purposes, see for instance previously incorporated U.S. Pat. No. 5,880,241.

Depending on the process conditions used and the polymerization catalyst system chosen, polymers, even those made from the same monomer(s) may have varying properties. Some of the properties which may change are molecular weight and molecular weight distribution, crystallinity, melting point, and glass transition temperature. Except for molecular weight and molecular weight distribution, branching can affect all the other properties mentioned, and branching may be varied (using the same nickel compound) using methods described in previously incorporated U.S. Pat. No. 5,880,241.

It is known that blends of distinct polymers, that-vary for instance in the properties listed above, may have advantageous properties compared to “single” polymers. For instance it is known that polymers with broad or bimodal molecular weight distributions may be melt processed (be shaped) more easily than narrower molecular weight distribution polymers. Thermoplastics such as crystalline polymers may often be toughened by blending with elastomeric polymers.

Therefore, methods of producing polymers which inherently produce polymer blends are useful especially if a later separate (and expensive) polymer mixing step can be avoided. However in such polymerizations one should be aware that two different catalysts may interfere with one another, or interact in such a way as to give a single polymer.

In such a process the Ni containing polymerization catalyst disclosed herein can be termed the first active polymerization catalyst. Monomers useful with these catalysts are those described (and also preferred) above. A second active polymerization catalyst (and optionally one or more others) is used in conjunction with the first active polymerization catalyst. The second active polymerization catalyst may be another late transition metal catalyst, for example as described in previously incorporated WO98/30609, U.S. Pat. Nos. 5,880,241 and 6,060,569, as well as in U.S. Pat. Nos. 5,714,556 and 5,955,555, which are also incorporated by reference herein for all purposes as if fully set forth.

Other useful types of catalysts may also be used for the second active polymerization catalyst. For instance so-called Ziegler-Natta and/or metallocene-type catalysts may also be used. These types of catalysts are well known in the polyolefin field, see for instance Angew. Chem., Int. Ed. Engl., vol. 34, p. 1143-1170 (1995), EP-A-0416815 and U.S. Pat. No. 5,198,401 for information about metallocene-type catalysts, and J. Boor Jr., Ziegler-Natta Catalysts and Polymerizations, Academic Press, New York, 1979 for information about Ziegler-Natta-type catalysts, all of which are incorporated by reference herein for all purposes as if fully set forth. Many of the useful polymerization conditions for all of these types of catalysts and the first active polymerization catalysts coincide, so conditions for the polymerizations with first and second active polymerization catalysts are easily accessible. Oftentimes the “co-catalyst” or “activator” is needed for metallocene or Ziegler-Natta-type polymerizations. In many instances the same compound, such as an alkylaluminum compound, may be used as an “activator” for some or all of these various polymerization catalysts.

In one preferred process described herein the first olefin(s) (the monomer(s) polymerized by the first active polymerization catalyst) and second olefin(s) (the monomer(s) polymerized by the second active polymerization catalyst) are identical, and preferred olefins in such a process are the same as described immediately above. The first and/or second olefins may also be a single olefin or a mixture of olefins to make a copolymer. Again it is preferred that they be identical particularly in a process in which polymerization by the first and second active polymerization catalysts make polymer simultaneously.

In some processes herein the first active polymerization catalyst may polymerize a monomer that may not be polymerized by said second active polymerization catalyst, and/or vice versa. In that instance two chemically distinct polymers may be produced. In another scenario two monomers would be present, with one polymerization catalyst producing a copolymer, and the other polymerization catalyst producing a homopolymer, or two copolymers may be produced which vary in the molar ;proportion or repeat units from the various monomers. Other analogous combinations will be evident to the artisan.

In another variation of this process one of the polymerization catalysts makes an oligomer of an olefin, preferably ethylene, which oligomer has the formula R⁷⁰CH═CH₂, wherein R⁷⁰ is n-alkyl, preferably with an even number of carbon atoms. The other polymerization catalyst in the process them (co)polymerizes this olefin, either by itself or preferably with at least one other olefin, preferably ethylene, to form a branched polyolefin. Preparation of the oligomer (which is sometimes called an α-olefin) by a second active polymerization-type of catalyst can be found in previously incorporated U.S. Pat. No. 5,880,241 as well as U.S. Pat. No. 6,103,946 (also incorporated by reference for all purposes as if fully set forth).

Likewise, conditions for such polymerizations, using catalysts of the second active polymerization type, will also be found in the appropriate above mentioned references.

Two chemically different active polymerization catalysts are used in this polymerization process. The first active polymerization catalyst is described in detail above. The second active polymerization catalyst may also meet the limitations of the first active polymerization catalyst, but must be chemically distinct. For instance, it may have a different transition metal present, and/or utilize a different type of ligand and/or the same type of ligand which differs in structure between the first and second active polymerization catalysts. In one preferred process, the ligand type and the metal are the same, but the ligands differ in their substituents.

Included within the definition of two active polymerization catalysts are systems in which a single polymerization catalyst is added together with another ligand, preferably the same type of ligand, which can displace the original ligand coordinated to the metal of the original active polymerization catalyst, to produce in situ two different polymerization catalysts.

The molar ratio of the first active polymerization catalyst to the second active polymerization catalyst used will depend on the ratio of polymer from each catalyst desired, and the relative rate of polymerization of each catalyst under the process conditions. For instance, if one wanted to prepare a “toughened” thermoplastic polyethylene that contained 80% crystalline polyethylene and 20% rubbery polyethylene, and the rates of polymerization of the two catalysts were equal, then one would use a 4:1 molar ratio of the catalyst that gave crystalline polyethylene to the catalyst that gave rubbery polyethylene. More than two active polymerization catalysts may also be used if the desired product is to contain more than two different types of polymer.

The polymers made by the first active polymerization catalyst and the second active polymerization catalyst may be made in sequence, i.e., a polymerization with one (either first or second) of the catalysts followed by a polymerization with the other catalyst, as by using two polymerization vessels in series. However it is preferred to carry out the polymerization using the first and second active polymerization catalysts in the same vessel(s), i.e., simultaneously. This is possible because in most instances the first and second active polymerization catalysts are compatible with each other, and they produce their distinctive polymers in the other catalyst's presence. Any of the processes applicable to the individual catalysts may be used in this polymerization process with 2 or more catalysts, i.e., gas phase, liquid phase, continuous, etc.

Catalyst components which include Ni complexes of (I), with or without other materials such as one or more cocatalysts and/or other polymerization catalysts are also disclosed herein. For example, such a catalyst component could include the Ni complex supported on a support such as alumina, silica, a polymer, magnesium chloride, sodium chloride, etc., with or without other components being present. It may simply be a solution of the Ni complex, or a slurry of the Ni complex in a liquid, with or without a support being present.

The polymers produced by this process may vary in molecular weight and/or molecular weight distribution and/or melting point and/or level of crystallinity, and/or glass transition temperature and/or other factors. For copolymers the polymers may differ in ratios of comonomers if the different polymerization catalysts polymerize the monomers present at different relative rates. The polymers produced are useful as molding and extrusion resins and in films as for packaging. They may have advantages such as improved melt processing, toughness and improved low temperature properties.

Hydrogen or other chain transfer agents such as silanes (for example trimethylsilane or triethylsilane) may be used to lower the molecular weight of polyolefin produced in the polymerization process herein. It is preferred that the amount of hydrogen present be about 0.01 to about 50 mole percent of the olefin present, preferably about 1 to about 20 mole percent. When liquid monomers (olefins) are present, one may need to experiment briefly to find the relative amounts of liquid monomers and hydrogen (as a gas). If both the hydrogen and monomer(s) are gaseous, their relative concentrations may be regulated by their partial pressures.

In the Examples, all pressures are gauge pressures. Branching was determined by ¹H NMR, taking the total of the methyl carbon atoms as the number of branches. Branching is uncorrected for end groups. The following abbreviations are used:

-   -   BINAP—see compound (XI)     -   dba—dibenzylideneacetone     -   EtOAc—ethyl acetate     -   EtOH—ethanol     -   Mn—number average molecular weight     -   Mp—melting point     -   NEt₃—triethylamine     -   PDI—weight average molecular weight/number average molecular         weight     -   PhCl—chlorobenzene     -   RT—room temperature     -   THF—tetrahydrofuran     -   Tm—melting point

EXAMPLES 1-11 Preparation of 2-Anilinotropones

General Procedure A—The Conversion of 2-Triflatotropone to 2-Anilinotropones with Liquid Anilines

A Schlenk tube, flame-dried in vacuo, was placed under an Ar atmosphere on a vacuum line. The tube was charged with Pd₂(dba)₃ (5 mg, 0.005 mmol), rac-BINAP (7 mg, 0.01 mmol), Cs₂CO₃ (456 mg, 1.4 mmol), and 2-triflatotropone (254 mg, 1.0 mmol). Toluene (2 mL) was added followed by the appropriate aniline (1.2 mmol). The Schlenk tube was sealed and heated to 80° C. for approximately 12 h. The reaction mixture was allowed to cool to RT, filtered through a pad of silica gel with the aid of ethyl ether (100 mL), and concentrated to afford the crude product. Purification was effected via flash column chromatography on silica gel.

General Procedure B—The Conversion of 2-Triflatotropone to 2-Anilinotropones with Solid Anilines

A Schlenk tube, flame-dried in vacuo, was placed under an Ar atmosphere on a vacuum line. The tube was charged with Pd₂(dba)₃ (5 mg, 0.005 mmol), rac-BINAP (7 mg, 0.01 mmol), Cs₂CO₃ (456 mg, 1.4 mmol), 2-triflatotropone (254 mg, 1.0 mmol), and the appropriate aniline (1.2 mmol). Toluene (2 mL) was added and the Schlenk tube was sealed and heated to 80° C. for approximately 12 h. The reaction mixture was allowed to cool to RT, filtered through a pad of silica gel with the aid of ethyl ether (100 mL), and concentrated to afford the crude product. Purification was effected via flash column chromatography on silica gel.

The individual Examples 1-11 below give the aniline used to produce the corresponding 2-anilinotropone (substitution patter on the phenyl rings remained the same).

EXAMPLE 1

General procedure A was used to convert 2,6-dimethylaniline (148 μl, 1.2 mmol) to the desired product in 15 h. Purification via flash column chromatography (eluants 3:2 hexane:ether) afforded 201 mg (90% yield) of an orange solid. Mp: 76-78° C. ¹H NMR (250 MHz, CDCl₃): δ 8.40 (bs, 1 H); 7.32 (m, 2 H); 7.18 (m, 3 H); 7.08 (t, J=10.5 Hz, 1 H); 6.73 (m, 1 H); 6.22 (d, J=10.5 Hz, 1 H); 2.15 (s, 6 H). ¹³C NMR (100 MHz, CDCl₃): δ 176.6, 154.6, 137.3, 136.3, 136.2, 135.1, 129.9, 128.7, 127.8, 123.5, 109.6, 18.0. Anal. Calcd for C₁₅H₁₅NO: C, 79.97; H, 6.71; N, 6.22. Found: C, 79.92; H, 6.71; N, 6.05.

EXAMPLE 2

General procedure A was used to convert 2,6-di-i-propylaniline (227 μl, 1.2 mmol) to the desired product in 14 h. Purification via flash column chromatography (eluants 2:1 hexane:ether) afforded 242 mg (86% yield) of an orange solid. Mp: 86-88° C. ¹H NMR (200 MHz, CDCl₃):δ 8.42 (bs, 1 H); 7.43-7.24 (m, 5 H); 7.06 (t, J=10.2 Hz, 1 H); 6.71 (m, 1 H); 6.26 (d, J=10.2 Hz, 1 H); 2.90 (m, 2 H); 1.15 (d, J=7.0 Hz, 6 H); 1.11 (d, J=7.0 Hz, 6 H). ¹³C NMR (100 MHz, CDCl₃): δ 176.5, 156.4, 146.9, 137.5, 136.2, 132.5, 130.0, 128.9, 124.4, 123.6, 110.4, 28.6, 24.6, 23.4. Anal. Calcd for C₁₉H₂₃NO: C, 81.10; H, 8.24; N, 4.98. Found: C, 81.15; H, 8.20; N, 4.94.

EXAMPLE 3

General procedure A was used to convert 2-t-butylaniline (187 μl, 1.2 mmol) to the desired product in 16 h. Purification via flash column chromatography (eluants 3:1 hexane:ether) afforded 221 mg (88% yield) of an orange solid. Mp: 92-94° C. ¹H NMR (250 MHz, CDCl₃): δ 8.80 (bs, 1 H); 7.53 (m, 1 H); 7.35-7.25 (m, 4 H); 7.20 (m, 1 H); 7.10 (d, J=10.2 Hz, 1 H); 6.75 (m, 2 H); 1.37 (3, 9 H). ¹³C NMR (100 MHz, CDCl₁₃): δ 176.8, 155.2, 146.8, 137.5, 136.8, 136.2, 130.0, 128.6, 127.7, 127.3, 127.2, 123.7, 110.8, 35.1, 30.5. Anal. Calcd for C₁₇H₁₉NO: C, 80.59; H, 7.56; N, 5.53. Found: C, 80.34; H, 7.52; N, 5.51.

EXAMPLE 4

General procedure A was used to convert 2-t-butyl-6-methylaniline (196 mg, 1.2 mmol) to the desired product in 15.5 h. Purification via flash column chromatography (eluants 2:1 hexane:ether) afforded 97 mg (36% yield) of an orange solid. Mp: 115-117° C. ¹H NMR (200 MHz, CDCl₃): δ 8.69 (bs, 1 H); 7.41-7.18 (m, 5 H); 7.09 (t, J=10.2 Hz, 1 H); 6.73 (m, 1 H); 6.17 (d, J=10.2 Hz, 1 H); 2.06 (s, 3 H); 1.32 (s, 9 H). ²³C NMR (100 MHz, CDCl₃): δ 176.7, 155.2, 148.4, 137.6, 135.1, 130.0, 129.5, 127.9, 125.4, 123.6, 111.0, 35.5, 31.1, 18.6. Anal. Calcd for C₁₈H₂₁NO: C, 80.86; H, 7.92; N, 5.24. Found: C, 80.61; H, 7.93; N, 5.14.

EXAMPLE 5

General procedure B was used to convert 2,6-dichloroaniline (194 mg, 1.2 mmol) to the desired product in 14.5 h. Purification via flash column chromatography (eluants 2:1 hexane:ether) afforded 200 mg (75% yield) of an orange solid. Mp: 63-65° C. ¹H NMR (200 MHz, CDCl₂): δ 8.48 (bs, 1 H); 7.47 (d, J=8.0 Hz, 2 H); 7.37 (m, 2 H); 7.26 (t, J=8.0 Hz, 1 H); 7.13 (t, J=10.2 Hz, 1 H); 6.83 (m, 1 H); 6.29 (d, J=10.2 Hz, 1 H). ¹³C NMR (100 MHz, CDCl₃): δ 177.1, 152.4, 137.5, 135.7, 134.0, 133.5, 131.7, 129.0, 128.7, 125.3, 111.3. Anal. Calcd for C₁₃H₉NOCl₂: C, 58.67; H, 3.41; N, 5.26. Found: C, 58.78; H, 3.46; N, 5.22.

EXAMPLE 6

General procedure B on half the scale with the modification of 12 mg (0.0125 mmol) Pd₂dba₃ and 16 mg (0.025 mmol) rac-BINAP was used to convert 2,6-dibromoaniline (151 mg, 0.60 mmol) to the desired product in 15 h. Purification via flash column chromatography (eluants 2:1 hexane:ether) afforded 122 mg (69% yield) of an orange solid. Mp: 73-75° C. ¹H NMR (200 MHz, CDCl₃): δ 8.49 (bs, 1 H); 7.68 (d, J=8.0 Hz, 2 H); 7.35 (m, 2 H); 7.12 (m, 2 H); 6.83 (m, 1 H); 6.27 (d, J=10.2 Hz, 1 H). ¹³C NMR (100 MHz, CDCl₃): δ 177.1, 152.5, 137.6, 136.3, 135.4, 133.0, 131.9, 129.9, 125.3, 124.4, 111.3. Anal. Calcd for C₁₃H₉NOBr₂: C, 43.98; H, 2.56; N, 3.95. Found: C, 43.88; H, 2.61; N, 3.88.

EXAMPLE 7

General procedure B was used to convert 2,3,4,5,6-pentafluoroaniline (220 mg, 1.2 mmol) to the desired product in 15.5 h. Purification via flash column chromatography (eluants 2:1 hexane:ether) afforded 256 mg (84% yield) of a green solid. The compound was isolated as a hydrate. Mp: 156-158° C. ¹H NMR (400 MHz, CDCl₃): δ 8.19 (bs, 1 H); 7.38 (dd, J=8.2, 11.8 Hz, 1 H); 7.32 (d, J=11.0 Hz, 1 H); 7.15 (t, J=10.2 Hz, 1 H); 6.87 (t, J=9.0 Hz, 1 H); 6.49 (dt, J=2.6, 10.0 Hz, 1 H); 2.14 (s, 2 H, coordinated H₂O). ¹³C NMR (100 MHz, CDCl₃): δ 177.2, 151.6, 143.0 (dm, J=250 Hz), 139.7 (dm, J=253 Hz), 138.1 (dm, J=253 Hz), 137.7, 135.2, 132.5, 126.4, 113.7 (dt, J=3.8, 14.2 Hz), 111.6. ¹⁹F NMR (376 MHz, CDCl₃): δ−144.5 (m), −157.31 (m), −161.87 (m). Anal. Calcd for C₁₃H₆NOF₅: C, 54.36; H, 2.11; N, 4.88. Found: C, 54.31; H, 2.18; N, 4.81.

EXAMPLE 8

General procedure A was used to convert 3,5-bistrifluoromethylaniline (188 μl, 1.2 mmol) to the desired product in 15.5 h. Purification via flash column chromatography (eluants 2:1 hexane:ether) afforded 313 mg (89% yield) of a green solid. Compound was isolated as a hydrate. ¹H NMR (400 MHz, CDCl₃): δ 8.87 (bs, 1 H); 7.75 (s, 2 H); 7.66 (s, 1 H); 7.38 (dd, J=8.5, 11.8 Hz, 1 H); 7.31 (d, J=11.8 Hz, 1 H); 7.20 (m, 2 H); 6.89 (m, 1 H); 2.15 (s, 2.7 H, coordinated H₂O). ¹³C NMR (100 MHz, CDCl₃): δ 117.5, 151.7, 140.8, 137.8, 135.4, 132.9 (q, J=33.5 Hz), 132.3, 126.6, 122.9 (q, J=271 Hz), 122.7, (d, J=2.9 Hz), 117.9 (t, J=3.4 Hz), 111.1. ¹⁹F NMR (376 MHz, CDCl₃): δ−63.6 (s).

EXAMPLE 9

General procedure B was used to convert 2,6-diphenylaniline (294 mg, 1.2 mmol) to the desired product in 16.5 h. Purification via flash column chromatography (eluants 2:1 hexane:ether) afforded 127 mg (37% yield) of a yellow solid.

EXAMPLE 10

General procedure A was used to convert 2,6-difluoroaniline (129 μl, 1.2 mmol) to the desired product in 19 hours. Purification via flash column chromatography (eluants 2:1 hexane:ether) afforded 219 mg (94% yield) of a yellow solid. ¹H NMR (400 MHz, CDCl₃): δ 8.30 (bs, 1 H); 7.35 (m, 2 H); 7.25 (m, 1 H); 7.16 (t, J=10.2 Hz, 1 H); 7.05 (m, 2 H); 6.84 (m, 1 H); 6.55 (dt, J=2.5, 10.2 Hz, 1 H). ¹³C NMR (100 MHz, CDCl₃): δ 177.0, 159.0 (d, J=4.6 Hz), 156.5 (d, J=4.6 Hz), 137.3, 135.5, 131.6, 127.3 (t, J=9.6 Hz), 125.2, 115.5 (t, J=15.6 Hz), 112.1 (m), 111.4. ¹⁹F NMR (376 MHz, CDCl₃): δ−116.6 (s). Anal. Calcd for C₁₃H₉NOF₂: C, 66.93; H, 3.89; N, 6.01. Found: C, 66.66; H, 3.90; N, 5.97.

EXAMPLE 11

General procedure A was used to convert 2-methyl-6-trifluoromethylaniline (630 μl, 3.6 mmol) to the desired product in 14.5 hours. Purification via flash column chromatography (eluants 2:1 hexane:ether) afforded 781 mg (93% yield). ¹H NMR (400 MHz, CDCl₃): δ 8.50 (bs, 1 H); 7.64 (d, J=7.8 Hz, 1 H); 7.55 (d, J=7.6 Hz, 1 H); 7.41 (at, J=7.8 Hz, 1 H); 7.33 (m, 2 H); 7.07 (at, J=10.2 Hz, 1 H); 6.77 (m, 1 H); 6.14 (d, J=10.1 Hz, 1 H); 2.17 (s, 3 H). ¹³C NMR (100 MHz, CDCl₃): δ 176.8, 154.2, 138.6, 137.4, 135.8, 134.9, 134.5, 131.1, 128.4 (q, J=29.6 Hz), 127.6, 124.8 (q, J=5.2 Hz), 124.4, 123.3 (q, J=272 Hz), 110.5, 17.7. ³¹P NMR (377 MHz, C₆D₆): δ−62.2. Anal. Calcd for C₁₅H₁₂NOF₃: C, 64.51; H, 4.33; N, 5.02. Found: C, 64.23; H, 4.24; N, 4.87.

EXAMPLE 12

General procedure A was used to convert 2-methylaniline (384 μL, 3.6 mmol) to the desired product in 14.5 hours. Purification via flash column chromatography (eluants 2:1 hexane:ether) afforded 561 mg (89% yield). ¹H NMR (400 MHz, CDCl₃): δ 8.57 (bs, 1 H); 7.40-7.30 (m, 3 H); 7.30-7.21 (m, 3 H); 7.12 (dd, J=10, 10.4 Hz, 1 H); 6.77 (m, 1 H); 6.71 (d, J=10.4 Hz, 1 H); 2.21 (s, 3 H). ¹³C NMR (100 MHz, CDCl₃): δ 176.5, 154.5, 137.5, 136.5, 136.2, 134.6, 131.4, 130.2, 127.1, 126.1, 124.2, 110.6, 17.8. Anal. Calcd for C₁₄H₁₃NO: C, 79.59; H, 6.20; N, 6.63. Found: C, 79.62; H, 6.17; N, 6.62.

EXAMPLES 13-22

General Procedure for the Synthesis of Na Salts of 2-Anilinotropones: To a side arm flask in a glovebox was added NaH (1.2 equiv). The flask was removed from the glovebox and placed on a vacuum line under argon. THF (5-10 mL) was added to the flask, and the flask was cooled with an ice water bath. Slow addition of the 2-anilinotropone (1 equiv) as a solution in THF (3 mL) resulted in vigorous bubbling. When bubbling ceased, the flask was removed from the ice water bath and allowed to warm to rt. After 2 h, the solution was cannula filtered away from the remaining NaH, and the residual NaH was washed with THF (3 mL). The THF was removed in vacuo to produce essentially a quantitative yield of the desired salt as its THF adduct. The amount of THF incorporated varied with different salts and was determined by ¹H NMR.

EXAMPLE 13

Na Salt of 2-(2,6-diisopropylanilino)tropone: The general procedure was employed with 1.28 g (4.5 mmol) anilinotropone and 120 mg (5 mmol) NaH. The salt was isolated with 1 equiv of THF. ¹H NMR (250 MHz, C6D₆): δ 7.18-7.04 (m, 3 H); 6.6-6.4 (m, 3 H); 6.32 (dd, J=8.0, 12.2 Hz, 1 H); 6.02 (dt, J=3.2, 7.8 Hz, 1 H); 3.36 (THF); 2.94 (m, 2 H); 1.26 (THF); 1.14 (d, j=7.0 Hz, 6 H); 1.00 (d, J=7 Hz, 1 H). ¹³C NMR (100 MHz, C₆D₆): δ 177.6, 165.8, 148.7, 139.0, 134.4, 133.5, 124.2, 123.5, 121.2, 118.4, 117.9, 68.0, 28.2, 25.6, 24.9, 23.9.

EXAMPLE 14

Na Salt of 2-(2,6-dimethylanilino)tropone: The general procedure was employed with 405 mg (1.8 mmol) anilinotropone and 50 mg (2 mmol) NaH. The salt was isolated with 2.18 equiv of THF. ¹H NMR (400 MHz, C₆D₆): δ 7.05 (m, 2 H); 6.92 (m, 1 H); 6.58-6.33 (m, 4 H); 6.05 (m, 1 H); 3.40 (THF); 1.94 (s, 6 H); 1.31 (THF).

EXAMPLE 15

Na Salt of 2-(2-t-butylanilino)tropone: The general procedure was employed with 462 mg (1.8 mmol) anilinotropone and 50 mg (5 mmol) NaH. The salt was isolated with 1.5 equiv of THF. ¹H NMR (250 MHz, C₆D₆): δ 7.42 (d, J=8.0 Hz, 1 H); 6.98 (m, 1 H); 6.66 (m, 2 H); 6.45 (m, 3 H); 6.04 (at, J=9.0 Hz, 1 H); 3.44 (THF); 1.37 (THF); 1.29 (s, 9 H).

EXAMPLE 16

Na Salt of 2-(2-t-butyl-6-methylanilino)tropone: The general procedure was employed with 303 mg (1.14 mmol) anilinotropone and 31 mg (1.3 mmol) NaH. The salt was isolated with 1.16 equiv of THF. ¹H NMR (400 MHz, C₆D₆): δ 7.33 (d, J=7.6 Hz, 1 H); 7.07 (d, J=7.6 Hz, 1 H); 6.94 (at, J=7.6 Hz, 1 H); 6.52 (m, 2 H); 6.39 (m, 2 H); 6.04 (m, 1 H); 3.40 (THF); 1.97 (s, 3 H); 1.30 (s, 9 H+THF).

EXAMPLE 17

Na Salt of 2-(2,6-diphenylanilino)tropone: The general procedure was employed with 352 mg (1.0 mmol) anilinotropone and 28 mg (1.2 mmol) NaH. The salt was isolated with 0.55 equiv of THF. ¹H NMR (400 MHz, C₆D₆): δ 7.28 (d, J=7.6 Hz, 2 H); 7.19 (d, J=6.8 Hz, 2 H); 7.04 (t, J=7.6 Hz, 1 H); 6.81 (m, 6 H); 6.63 (d, J=11.6 Hz, 1 H); 6.44 (m, 2 H); 6.08 (at, J=9.0 Hz, 1 H); 6.00 (d, J=10.4 Hz, 1 H) 3.52 (THF); 1.39 (THF).

EXAMPLE 18

Na Salt of 2-(2-methyl-6-trifluoromethylanilino)-tropone: The general procedure was employed with 688 mg (2.5 mmol) anilinotropone and 71 mg (2.95 mmol) NaH. The salt was isolated with 1 equiv of THF. ¹H NMR (400 MHz, C₆D₆): δ 7.39 (d, J=7.6 Hz, 1 H); 7.06 (d, J=7.6 Hz, 1 H); 6.70 (at, J=7.6 Hz, 1 H); 6.57 (m, 2 H); 6.45 (dd, J=8.2, 11.6 Hz, 1 H); 6.28 (d, J=11.6 Hz, 1 H); 6.08 (at, J=8.8 Hz, 1 H); 3.46 (THF); 1.88(s, 3 H); 1.33(THF).

EXAMPLE 19

Na Salt of 2-(2,6-dichloroanilino)tropone: The general procedure was employed with 658 mg (2.5 mmol) anilinotropone and 71 mg (2.95 mmol) NaH. The salt was isolated with 1.6 equiv of THF. ¹H NMR (400 MHz, C₆D₆): δ 7.08 (d, J=8.0 Hz, 2 H); 6.73 (d, J=10.4 Hz, 1 H); 6.59 (at, J=10.2 Hz, 1 H); 6.51 (m, 1 H); 6.39 (m, 2 H); 6.11 (at, J=9.2 Hz, 1 H); 3.50 (THF); 1.35 (THF).

EXAMPLE 20

Na Salt of 2-(2,6-dibromoanilino)tropone: The general procedure was employed with 721 mg (2.0 mmol) anilinotropone and 58 mg (2.44 mmol) NaH. The salt was isolated with 1 equiv of THF. ¹H NMR (400 MHz, C₆D₆): δ 7.26 (m, 2 H); 6.74 (m, 1 H); 6.61 (m, 1 H); 6.50 (m, 1 H); 6.35 (d, J=11.2 Hz, 1 H); 6.23 (m, 1 H); 6.14 (m, 1 H); 3.51 (THF); 1.33 (THF).

EXAMPLE 21

Na Salt of 2-(2-methylanilino)tropone: The general procedure was employed with 508 mg (2.4 mmol) anilinotropone and 69 mg (2.9 mmol) NaH. The salt was isolated with 0.89 equiv of THF. ¹H NMR (400 MHz, C₆D₆): δ 7.11 (m, 2 H); 6.93 (m, 1 H); 6.64-6.45 (m, 4 H); 6.41 (dd, J=8.6, 11.4 Hz, 1 H); 6.08 (at, J=9.0 Hz, 1 H); 3.46 (THF); 1.89 (s, 3 H); 1.32 (THF).

EXAMPLE 22

Na Salt of 2-(2,3,4,5,6-pentafluoroanilino)tropone: The general procedure was employed with 581 mg (1.9 mmol) anilinotropone and 100 mg (4.2 mmol) NaH. The salt was isolated with no excess THF. ¹H NMR (400 MHz, d₆-acetone): δ 6.85 (at, H=10.2 Hz, 1 H); 6.73 (d, J=10 Hz, 1 H); 6.69 (at J=11.4 Hz, 1 H); 6.19 (d, J=11.2 Hz, 1 H); 6.14 (at, J=9.2 Hz, 1 H).

EXAMPLES 23-32

General Procedure for the Synthesis of Ni Complexes: To a flame dried Schlenk flask in a glovebox were added the sodium salt of a 2-anilinotroponee.THF (1 equiv) and (Ph₃P)₂Ni(Ph)(Cl) (1 equiv). The flask was removed from the glovebox, was placed on a vacuum line under Ar, and was cooled to −30° C. with a dry ice/acetone bath. THF (˜15 mL) was added to the flask, which was allowed to warm to RT over 1 h. The reaction was allowed to stir at ambient temperature for 1 h. THF was removed in vacuo and the crude reaction mixture dissolved in toluene (˜15 mL). Cannula transfer onto a pad of Celite was followed by filtration under Ar. The Celite® pad was washed with toluene (3×5 mL), and the solvent volume was reduced to 3-5 mL. Pentane (50 mL) was added, and the Schlenk flask was placed in a −30° C. freezer overnight. Solvent was removed from the precipitate via cannula filtration, and the residual solid was washed with pentane (3×10 mL). Drying in vacuo produces the desired nickel complex.

EXAMPLE 23

2-(2,6-Diisopropylanilino)tropone Ni Complex (VIII): The general procedure was employed with 201 mg (0.54 mmol) of the sodium salt and 372 mg (0.54 mmol) of (Ph₃P)₂Ni(Ph)(Cl) to afford 241 mg (67%) of the desired complex as a yellow-orange solid. ¹H NMR (400 MHz, C₆D₆): δ 7.63 (m, 6 H); 7.08 (d, J=7.0 Hz, 2 H); 6.98 (m, 12 H); 6.76 (d, J=10.4 Hz, 1 H); 6.58 (at, J=9.9 Hz, 1 H). 6.53 (d, J=11.5 Hz, 1 H); 6.45-6.33 (m, 4 H); 6.13 (at, J=9.4 Hz, 1 H); 3.82 (sept, J=6.8 Hz, 2 H); 1.32 (d, J=6.8 Hz, 6 H); 1.09 (d, J=6.8 Hz, 6 H). ¹³C NMR (100 MHz, C₆D₆): δ 180.2 (d, J=7.6 Hz), 169.6 148.9 (d, J=45 Hz), 144.4, 142.3, 138.1 (d, J=2.2 Hz), 134.6 (d, J=10.5 Hz), 133.1, 132.0, 131.6, 129.9 (d, J=1.9 Hz), 125.9, 125.5 (d, J=2 Hz), 123.7, 122.2, 121.7, 121.3, 121.1, 29.0, 25.9, 23.9. ³¹P NMR (162 MHz, C₆D₆): δ 28.9. Anal. Calcd for C₄₃H₄₂NOPNi: C, 76.12; H, 6.24; N, 2.06. Found: C, 75.83; H, 6.24; N, 1.98.

EXAMPLE 24

2-(2,6-dimethylanilino)tropone Ni Complex: The general procedure was employed with 172 mg (0.54 mmol) of the sodium salt and 372 mg (0.54 mmol) of (Ph₃P)₂Ni(Ph)(Cl) to afford 190 mg (57%) of the desired complex as a yellow-orange solid. ¹H NMR (400 MHz, CD₂Cl₂): δ 7.54 (m, 6 H); 7.39 (m, 3 H); 7.28 (m, 6 H); 7.21 (d, J=8 Hz, 2 H); 7.09 (dd, J=10, 10.6 Hz, 1 H); 6.99 (m, 2 H); 6.94 (d, J=10.6 Hz, 1 H); 6.71 (d, J=10.7 Hz, 1 H); 6.63 (at, J=9.5 Hz, 1 H); 6.56 (t, J=8 Hz, 1 H); 6.22 (m, 2 H); 6.14 (m, 2 H); 2.21 (s, 6 H). ¹³C NMR (100 MHz, CD₂Cl₂): δ 179.9 (d, J=7.2 Hz), 167.7, 150.3 (d, J=44.5 Hz), 146.4, 136.9 (d, J=1.8 Hz), 134.7, 134.6 (d, J=10.7 Hz), 134.3, 131.8 (d, J=1.9 Hz), 131.4, 130.1, 128.2 (d, J=9.7 Hz), 127.7, 124.8 (d, J=2.6 Hz), 124.3, 122.0, 121.1, 120.5, 117.7, 18.3. ³¹P NMR (162 MHz, C₆D₆): δ 29.03. Anal. Calcd for C₃₉H₃₄NOPNi: C, 75.26; H, 5.51; N, 2.25. Found: C, 75.49; H, 5.57; N, 2.38.

EXAMPLE 25

2-(2-t-Butylanilino)tropone Ni Complex: The general procedure was employed with 201 mg (0.53 mmol) of the sodium salt and 372 mg (0.54 mmol) of (Ph₃P)₂Ni(Ph)(Cl) to afford 195 mg (57%) of the desired complex as a yellow-orange solid. ¹H NMR (400 MHz, CD₂Cl₂): δ 7.47 (m, 6 H); 7.38 (m, 3 H); 7.28 (m, 6 H); 7.18 (dd, J=1.4, 8 Hz, 1 H); 7.11 (bs, 1 H); 6.95 (at, J=10.2 Hz, 1 H); 6.81 (m, 2 H); 6.72 (m, 1 H); 6.55 (M, 2 H); 6.46 (d, J=9.4 Hz, 1 H); 6.42 (dd, J=1.6, 7.7 Hz, 1 H); 6.23 (m, 2 H); 6.07 (bs, 1 H); 1.51 (s, 9 H). ¹³C NMR (100 MHz, CD₂Cl₂): δ 179.9 (d, J=7.5 Hz), 169.1, 151.3 (d J=45 Hz), 146.9, 142.3, 138.4 (broad), 137.8 (broad), 134.8, 134.6 (d, J=10.5 Hz), 133.7, 131.9, 131.5, 130.1 (d, J=1.9 Hz), 128.9, 128.8, 128.2 (d, J=9.7 Hz), 126.3, 125.1 (broad), 124.2, 121.6, 120.9, 120.7, 120.5, 36.4, 32.8. ³¹P NMR (162 MHz, CD₂Cl₂): δ 29.34. Anal. Calcd for C₄₁H₃₈NOPNi: C, 75.71; H, 5.89; N, 2.15. Found: C, 75.76; H, 5.92; N, 2.19.

EXAMPLE 26

2-(2-t-Butyl-6-methylanilino)tropone Ni Complex: The general procedure was employed with 219 mg (0.59 mmol) of the sodium salt and 409 mg (0.59 mmol) of (Ph₃P)₂Ni(Ph)(Cl) to afford 185 mg (47%) of the desired complex as a yellow-orange solid. ¹H NMR (400 MHz, C₆D₆): δ 7.63 (m, 6 H); 7.23 (bs, 1 H); 7.15 (m, 1 H); 6.98 (m, 10 H); 6.81 (m, 2 H); 6.75 (d, J=10.4 Hz, 1 H); 6.58 (at, J=10 Hz, 1 H); 6.48 (m, 2 H); 6.41 (m, 3 H); 6.11 (at, J=9.0 Hz, 1 H); 2.46 (s, 3 H); 1.69 (s, 9 H). ¹³C NMR (100 MHz, CD₂Cl₂): δ 179.8 (d, J=7.3 Hz), 168.1, 149.3 (d, J=45.3 Hz), 145.6, 142.1, 138.3 (broad), 137.2 (broad), 134.7, 134.5 (d, J=10.5 Hz), 133.9, 133.1, 131.9, 131.4, 130.1, 128.2 (d, J=9.9 Hz), 128.1, 127.1, 124.9 (broad), 124.4, 121.7, 121.1, 120.4, 119.7, 36.9, 33.3, 19.6. ³¹P NMR (162 MHz, CD₂Cl₂): δ 29.02. Anal. Calcd for C₄₂H₄₀NOPNi: C, 75.92; H, 6.07; N, 2.11. Found: C, 75.75; H, 6.11; N, 2.15.

EXAMPLE 27

2-(2,6-Diphenylanilino)tropone Ni Complex: The general procedure was employed with 225 mg (0.55 mmol) of the sodium salt and 380 mg (0.55 mmol) of (Ph₃P)₂Ni(Ph)(Cl) to afford 220 mg (54%) of the desired complex as a yellow-orange solid. Compound was isolated with 0.33 eq of toluene. ¹H NMR (400 MHz, C₆D₆): δ 7.95 (d, J=7.6 Hz, 4 H); 7.49 (m, 6 H); 7.20 (m, 6 H); 7.13 (m, 6 H); 6.98 (8 H+toluene); 6.77 (d, J=11.6 Hz, 1 H); 6.55 (m, 2 H); 6.4 (m, 4 H); 6.02 (m, 1 H); 2.09 (toluene). ¹³C NMR (100 MHz, CD₂Cl₂): δ 179.6 (d, J=7.5 Hz), 168.9, 148.0 (d, J=45.1 Hz), 144.6, 140.8, 138.3 (d, J=2.7 Hz), 137.0, 134.8, 134.5 (d, J=10.6 Hz), 133.8, 131.8, 131.3, 130.5, 130.2, 130.0 (d, J=1.9 Hz), 129.3, 128.5, 128.1 (d, J=9.8 Hz), 127.7, 127.0, 125.6, 125.2, 124.9 (d, 1.9 Hz), 122.0, 121.2, 121.1, 120.5, 21.5. ³¹P NMR (162 MHz, C₆D₆): δ 29.03. Anal. Calcd for C₄₉H₃₈NOPNi.0.33 toluene: C, 79.3; H, 5.27; N, 1.80. Found: C, 79.24; H, 5.37; N, 1.77.

EXAMPLE 28

2-(2-Methyl-6-trifluoromethylanilino)tropone Ni Complex: The general procedure was employed with 192 mg (0.51 mmol) of the sodium salt and 357 mg (0.51 mmol) of (Ph₃P)₂Ni(Ph)(Cl) to afford 205 mg (59%) of the desired complex as a yellow-orange solid. ¹H NMR (400 MHz, CD₂Cl₂): δ 7.49 (m, 6 H); 7.37 (m, 3 H); 7.27 (m, 7 H); 7.04 (d, J=9.9 Hz, 1 H); 6.96 (m, 2 H); 6.86 (m, 2 H); 6.63 (d, J=10.6 Hz, 1 H); 6.55 (m, 2 H); 6.17 (m, 3 H); 6.05 (m, 1 H); 2.17 (s, 3 H). ¹³C NMR (100 MHz, CD₂Cl₂): spectrum is difficult to interpret due to extensive F coupling; δ 180.1 (d, J=7.3 Hz), 168.0, 149.4 (d, J=46.0 Hz), 146.4, 138.1, 136.8, 135.2, 134.8, 134.6 (d, J=10.6 Hz), 134.4, 134.0, 131.8, 131.3, 130.1 (d J=2.5 Hz), 128.2 (d, J=9.7 Hz), 126.2, 125.1 (broad), 124.8, 124.7 (broad), 124.5 (q, J=5.6 Hz), 124.3, 123.5, 122.4, 121.9, 121.1, 118.9, 18.2. ³¹P NMR (162 MHz, CD₂Cl₂): δ 29.37. Anal. Calcd for: C, 69.25; H, 4.62; N, 2.07. Found C₃₉H₃₁NOPNiF₃: C, 69.15; H, 4.57; N, 2.10.

EXAMPLE 29

2-(2,6-Dichloroanilino)tropone Ni Complex: The general procedure was employed with 200 mg (0.50 mmol) of the sodium salt and 344 mg (0.50 mmol) of (Ph₃P)₂Ni(Ph)(Cl) to afford 250 mg (75%) of the desired complex as a yellow-orange solid. ¹H NMR (400 MHz, C₆D₆): δ 7.54 (m, 6 H); 7.39 (m, 3 H); 7.29 (m, 6 H); 7.09 (dt, J=1.0, 10.2 Hz, 1 H); 6.96 (m, 5 H); 6.72 (d, J=10.8 Hz, 1 H); 6.70 (d, J=8.1 Hz, 1 H); 6.63 (at, J=9.5 Hz, 1 H); 6.23 (at, J=9.5 Hz, 1 H); 6.23 (m, 2 H); 6.14 (m, 2 H). ¹³C NMR (100 MHz, CD₂Cl₂): δ 180.2 (d, J=6.8 Hz), 167.7, 149.9 (d, J=45.3 Hz), 144.2, 137.1 (d, J=1.7 Hz), 135.5, 134.8, 134.7 (d, J=10.6 Hz), 131.7, 131.3, 130.2 (d, J=2 Hz), 128.2 (d, J=9.7 Hz), 128.1, 125.6, 124.9 (d, J=2.1 Hz), 123.2, 122.9, 121.4, 117.8. ³¹P NMR (162 MHz, CD₂Cl₂): δ 29.13. Anal. Calcd for C₃₇H₂₈NOPNiCl₂: C, 67.00; H, 4.26; N, 2.11. Found: C, 66.95; H, 4.37; N, 2.15.

EXAMPLE 30

2-(2,6-Dibromoanilino)tropone Ni Complex: The general procedure was employed with 220 mg (0.49 mmol) of the sodium salt and 341 mg (0.49 mmol) of (Ph₃P)₂Ni(Ph)(Cl) to afford 315 mg (85%) of the desired complex as a yellow-orange solid. ¹H NMR (400 MHz, CD₂Cl₂): δ 7.54 (m, 6 H); 7.39 (m, 3 H); 7.28 (m, 6 H); 7.21 (d, J=8.0 Hz, 2 H); 7.09 (m, 1 H); 7.00 (m, 2 H); 6.94 (d, J=10.4 Hz, 1 H); 6.72 (d, J=10.8 Hz, 1 H); 6.63 (at, J=9.4 Hz, 1 H); 6.56 (t, J=8.0 Hz, 1 H); 6.22 (m, 2 H); 6.14 (t, J=7.2 Hz, 2 H). ¹³C NMR (100 MHz, CD₂Cl₂): δ 180.2 (d, J=6.8 Hz), 167.3, 149.6 (d, J=45.7 Hz), 146.5, 137.4, 135.5, 134.8, 134.7 (d, J=10.6 Hz), 132.0, 131.7, 131.3, 130.2 (d, J=1.6 Hz), 128.2 (d, J=9.8 Hz), 126.4, 124.9 (d, J=2 Hz), 123.2, 123.0, 122.3, 121.4, 118.0. ³¹P NMR (162 MHz, CD₂Cl₂): δ 29.03. Anal. Calcd for C₃₇H₂₈NOPNiBr₂: C, 59.08; H, 3.75; N, 1.86. Found: C, 59.35; H, 3.82; N, 1.90.

EXAMPLE 31

2-(2-Methylanilino)tropone Ni Complex: The general procedure was employed with 100 mg (0.34 mmol) of the sodium salt and 234 mg (0.34 mmol) of (Ph₃P)₂Ni(Ph)(Cl) to afford 105 mg (51%) of the desired complex as a yellow-orange solid. ¹H NMR (400 MHz, CD₂Cl₂): δ 7.50 (m, 6 H); 7.39 (m, 3 H); 7.28 (m, 6 H); 6.98 (dt, J=1.0, 10.2 Hz, 1 H); 6.87-6.67 (m, 6 H); 6.59 (d, J=10.4 Hz, 1 H); 6.53 (dd, J=1.3, 7.6 Hz, 1 H); 6.49 (at, J=9.5 Hz, 1 H); 6.27 (d, J=11.6 Hz, 1 H); 6.18 (m, 2 H); 6.06 (bs, 1 H); 2.19 (s, 3 H) ¹³C NMR (100 MHz, CD₂Cl₂): δ 179.9 (d, J=7.5 Hz), 168.5, 151.6 (d, J=44.4 Hz), 147.8, 138.0 (broad), 137.1 (broad), 134.7, 134.6 (d, J=10.6 Hz), 134.1, 132.1, 131.9, 131.5, 130.1 (d, J=2.3 Hz), 130.0, 128.2 (d, J=9.7 Hz), 126.3, 126.2, 125.0 (broad), 124.2, 122.0, 121.0, 120.8, 118.6, 17.9. ³¹P NMR (162 MHz, CD₂Cl₂): δ 29.43. Anal. Calcd for C₃₈H₃₂NOPNi: C, 75.02; H, 5.30; N, 2.30. Found: C, 74.12; H, 5.33; N, 2.31.

EXAMPLE 32

2-(2,3,4,5,6-Pentafluoroanilino)tropone Ni Complex: The general procedure was employed with 136 mg (0.44 mmol) of the sodium salt and 308 mg (0.44 mmol) of (Ph₃P)₂Ni(Ph)(Cl) to afford 169 mg (57%) of the desired complex as a yellow-orange solid. ¹H NMR (400 MHz, CD₂Cl₂): δ 7.52 (m, 6 H); 7.39 (m, 3 H); 7.30 (m, 6 H); 7.18 (dt, J=0.9, 10.25 Hz, 1 H); 7.06 (m, 1 H); 6.87 (d, J=7.2 Hz, 2 H); 6.80 (d, J=10.8 Hz, 1 H); 6.74 (at, J=9.6 Hz, 1 H); 6.50 (d, J=11.2 Hz, 1 H); 6.36 (t, J=7.15 Hz, 1 H); 6.28 (m, 2 H). ¹³C NMR (100 MHz, CD₂Cl₂): spectrum difficult to interpret due to extensive F coupling. δ 180.8 (d, J=6.5 Hz), 169.1, 152.2 (d, J=45.5 Hz), 136.8, 136.2, 135.4, 134.6 (d, J=10.7 Hz), 132.3 (m), 131.4, 131.0, 130.3 (d, J=1.9 Hz), 128.9 (m), 128.3 (d, J=9.8 Hz), 125.5 (d, J=2.5 Hz), 124.5, 124.3, 122.0, 118.0. ³¹P NMR (162 MHz, CD₂Cl₂): δ 29.71. ¹⁹F NMR (377 MHz, CD₂Cl₂): δ−147.73 (m), −163.75 (t, J=22.6 Hz), −166.52 (m). Anal. Calcd for C₃₇H₂₅NOPNiF₅: C, 64.94; H, 3.68; N, 2.05. Found: C, 64.45; H, 3.90; N, 2.31.

EXAMPLE 33

Bistropone Ni Complex from 2-(2,6-diisopropylanilino)-tropone: To a flame dried Schlenk flask in a glovebox were added the sodium salt of the 2-anilinotroponee.THF (377 mg, 0.90 mmol)) and (DME)NiBr₂ (139 mg, 0.45 mmol). The flask was removed form the glovebox and placed on a vacuum line under Ar. Et₂O (20 mL) was added to the flask, and the reaction was allowed to stir at room temperature for 15 h. The crude reaction mixture was filtered through filter paper and condensed to produce 240 mg (88%) of a red-brown solid. ¹H NMR (400 MHz, C₆D₆): δ 7.29-7.21 (m, 6 H); 6.26-6.18 (m, 8 H); 5.92 (m, 2 H); 4.18 (sept, J=6.8 Hz, 4 H); 1.74 (d, J=6.8 Hz, 12 H); 1.19 (d, J=6.8 Hz, 12 H). ¹³C NMR (100 MHz, C₆D₆): δ 180.4, 168.9, 143.6, 141.1, 134.6, 133.8, 126.7, 124.0, 122.8, 120.7, 119.3, 29.2, 24.5, 24.1. Anal. Calcd for C₃₈H₄₂N₂O₂Ni: C, 73.67; H, 7.16; N, 4.50. Found: C, 74.10; H, 7.25; N, 4.39.

EXAMPLES 34-40 Polymerizations of Ethylene with (VIII)

A 1000 mL Parr® autoclave was heated under vacuum up to 110° C., was cooled, and was backfilled with ethylene. The autoclave was charged with toluene (190 mL), was degassed with ethylene (3×1.38 MPa), and was pressurized with ethylene to 2.76 MPa for the reaction. The stirring motor was engaged, and the reactor was allowed to equilibrate at the desired temperature for 10 min. In a glove box, a Schlenk flask was charged with the catalyst. The Schlenk flask was removed from the glove box and was placed on a vacuum line under Ar. The catalyst was dissolved in toluene (10 mL) and was cannula transferred into the autoclave which had been vented. The autoclave was sealed and was pressurized to 2.76 MPa. At the appropriate time, the reactor was vented, and the polymer was isolated via filtration and was dried in a vacuum oven. Variations in time, temperature, solvent, and catalyst loading were employed to generate the data in Table 2.

EXAMPLES 41-80

Unless otherwise noted, the “catalyst” (Ni compound) was (VIII).

General Procedure for High Pressure (Above Atmospheric) Ethylene Polymerizations. A 1000 mL Parr autoclave was heated under vacuum up to 110° C. and then was cooled to the desired reaction temperature and backfilled with ethylene. The autoclave was charged with solvent (190 mL), degassed with ethylene (2×1.38 MPa), and pressurized with ethylene to 1.38 MPa. The stirring motor was engaged, and the reactor allowed to equilibrate at the desired temperature for approximately 10 min. In a glovebox, a side arm flask was charged with the catalyst. The flask was removed from the glovebox and placed on a vacuum line under Ar. The catalyst was dissolved in 10 mL toluene and cannula transferred into the vented autoclave with stirring motor off. The autoclave was sealed and pressurized to the desired level, and the stirring motor was reengaged. After the prescribed reaction time, the stirring motor was stopped, the reactor was vented, and the polymer isolated via precipitation from methanol and dried in a vacuum oven. This procedure was employed with modifications in time, temperature, ethylene pressure, and solvent. For the additive studies, 170 mL of toluene and 20 mL of the respective additive were used in place of the 190 mL toluene mentioned above. For the studies with excess PPh₃, both the catalyst and PPh₃ were added in the same 10 mL toluene.

Procedure for Ethylene Polymerization at 1 atm. In a glovebox, a side arm flask was charged with the catalyst (7.6 μmol). The flask was removed from the glovebox and placed on a vacuum line under argon. Toluene (40 mL) was added to flask, and the flask was placed in an 80° C. oil bath. After 10 min, the flask was evacuated and backfilled with ethylene 3 times and left open to ethylene for the duration of the polymerization. After 2 h, the reaction was cooled to RT and poured into 200 mL stirred MeOH. After stirring 12 h, an oil had separated out on the bottom. The solvent was decanted and the residual oil dissolved in hexane. This solution was filtered through a pad of silica gel with additional hexane, and the solvent was removed in vacuo to yield polymer.

Some of these polymerization runs are reported under different example numbers in the tables. They are repeated to illustrate the effect of different variables on the polymerization. Table 3 shows the effect of temperature, Table 4 the effect of ethylene pressure, Table 5 the effect of catalyst loading, Table 6 the effect of various additives, and Table 7 the effect of various solvents. Table 8 shows the effect of varying the substitution on the phenyl ring derived from the aniline and the column labeled “Ar” gives that substitution pattern.

EXAMPLES 81-82 1-Hexene Polymerizations with (VIII)

A Schlenk flask in a glove box was charged with the catalyst. The flask was removed from the glove box and was placed on a vacuum line under Ar. Toluene and 1-hexene were added to a separate flask, and the flask was placed in an oil bath at the appropriate temperature and was allowed to equilibrate for 10 min. The catalyst was dissolved in toluene (0.50 mL) and was cannula transferred into the toluene/1-hexene solution. The solution was allowed to stir for the prescribed time, and the solvent and excess 1-hexene were removed to yield the crude polymer. Further purification was effected via filtration of a hexane solution of the polymer through a pad of Celite® and removal of the solvent in vacuo. These conditions were used to generate the data in Table 9.

TABLE 2 mol cat temp time Yield branches/ T_(m) Ex. (× 10⁶) Solvent (° C.) (h) (g) TON^(a) M_(n) PDI 1000 carbons (° C.) 14 3.0 Toluene 40 1.0 0.125 1490 68000 3.57 14 121 15 3.0 Toluene 60 1.0 0.740 8800 151000 2.39 29 102 16 3.0 Toluene 80 1.0 1.14 13600 101000 1.98 48 82 17 10.0 Toluene 40 1.0 1.615 5770 186000 3.67 10 124 18 14.8 Toluene  60^(b) 0.5 13.66 33000 57000 2.80 64 87 19 6.0 CH₂Cl₂ 40 1.0 0.312 1857 86000 4.04 — 116 20 7.6 Hexane 40 1.0 0.527 2480 112000 3.92 — 122 ^(a)mol PE/mol cat ^(b)Reaction exotherm to 103° C.

TABLE 3^(a) temp yield Branches per Ex. (° C.) (g) TON^(b) M_(n) PDI 1000 carbons 41 40 1.20 8240 203946 2.81 8 42 60 6.78 31900 292215 1.97 27 43 80 11.41 53600 118962 1.75 49 44 100 4.04 19000 60714 1.85 67 ^(a)2.76 MPa E pressure, 7.6 μmol catalyst, 1 h ^(b)mol PE/mol cat

TABLE 4 ethylene yield Branches per Ex. (MPa) (g) TON^(b) M_(n) PDI 1000 carbons 45^(c)  14 0.145 980 6700 2.03 113 46  50 4.0 27000 49774 1.68 90 47 100 6.3 42500 62485 1.89 76 48 200 9.2 62120 89637 1.84 61 49  200^(d) 7.63 52400 91500 1.84 61 50 400 7.1 47800 103908 1.95 45 51 600 2.6 17500 119571 1.97 41 ^(a)5.2 μmol catalyst, 1 h, 80° C. ^(b)kg PE/mol catalyst. ^(c)7.6 μmol cat, 40 mL toluene, 2 h. ^(d)10 min run, TOF 8.8 × 10⁶ g PE · mol cat⁻¹ · h⁻¹.

TABLE 5^(a) mol cat yield Branches per T_(m) Ex. (× 10⁶) (g) TON^(b) M_(n) PDI 1000 carbons (° C.) 52 3.0 0.74 8800 151000 2.39 29 102 53 7.6 6.78 31900 292215 1.97 27 54^(c) 14.8 13.66 33000 57000 2.80 64 87 ^(a)Ethylene pressure 2.76 MPa, 60° C., 1 h, ^(b)mol PE/mol cat ^(c)30 min run, exotherm to 103° C.

TABLE 6 additive yield Branches per Ex. Solvent (mL) (g) TON^(b) M_(n) PDI 1000 carbons 55 Toluene none 2.82 19000 189000 1.81 37 56 Toluene EtOAc 2.28 15700 192000 1.80 36 (1) 57 Toluene H₂O(1) 1.40 9600 128000 1.85 38 58 Hexane H₂O(1) 1.48 10200 135000 1.89 39 59 Toluene EtOH 1.12 7700 131000 1.88 37 (1) 60 Toluene NEt₃(1) 2.74 18800 146000 2.02 38 61 Toluene EtOAc 3.82 26200 163000 1.92 43 (20) 62 Toluene H₂O 0.850 5800 86000 2.31 41 (20) 63 Toluene EtOH 0.160 1100 21000 2.35 48 (20) 64 Toluene NEt₃ 0.720 5000 87000 1.54 37 (20) ^(a)5.3 μmol catalyst, ethylene pressure 1.38 MPa, 10 min, (200-X)mL solvent, X = mL additive. ^(b)mol PE/mol cat

TABLE 7 yield branches per Ex. solvent (g) TON^(b) M_(n) PDI 1000 carbons 65 toluene 2.82 19000 189000 1.81 37 66 THF 3.34 22500 146000 1.81 39 67 hexane 2.59 17400 163000 1.79 35 68 PhCl 4.78 32200 182000 1.90 46 69 PhCl^(b) 8.82 59300 71300 2.08 67 70 EtOAc 0.340 2290 66000 4.01 33 ^(a)Ethylene pressure 1.38 MPa, 60° C., 10 min, 52 μmol catalyst. ^(b)mol PE/mol cat ^(b) 80° C.

TABLE 8^(a) Yield Branches per Ex. Ar (g) TON^(b) M_(n) PDI 1000 carbons 71 2,6-di-i-Pr 7.63 52400 91500 1.84 61 72 2,6-diMe 4.74 32600 42400 1.74 61 73 2-CH₃-6-CF₃ 6.0 41200 87900 1.94 59 74 2,6-diPh 8.70 59800 94900 1.77 53 75 2,6-diCl 3.40 23400   10000^(c) 1.96 53 76 2,6-diBr 3.46 23800 22300 1.93 56 77 2-t-Bu-6-CH₃ 0.880 6000 115000  2.02 73 78 2-t-Bu Trace 17600 2.13 72 79 2-CH₃ 0.810? 5600   4700^(b) 2.41 57 80 pentafluoro 1.02? 7000   1570^(b) 3.03 49 ^(a)Ethylene pressure 1.38 MPa, 5.2 μmol catalyst, 80° C., 10 min. ^(b)mol PE/mol cat ^(c)M_(n) determined by ¹H NMR

TABLE 9 Ex. mol cat (×10⁶) Solvent^(a) 1-Hexene (vol %) Temp (° C.) time (h) yield (mg) TO DP branches/1000 carbons 81 7.6 Toluene 50 40 3 84 130 21 147 82 7.6 Toluene 50 60 3 127 200 16 152 ^(a)Total solution volume 2 mL

EXAMPLE 83 Synthesis of (IX)

To separate flame dried Schlenk flasks in a glove box were added the sodium salt of 2-(2,6-di-i-propylanilino)tropone.THF made in Example 12 (375 mg, 1.0 mmol), and (TMEDA)Ni(Ph)(Cl) [see E. Wenschub, Z. Chem., vol. 27, p. 448 (1987)] (286 mg, 1.0 mmol). Both flasks were removed from the glove box and placed on a vacuum line under Ar. Toluene (10 mL) was added to each flask, and the flask containing (TMEDA)Ni(Ph)(Cl) was cooled to −40° C. (acetone/dry ice bath). The toluene solution of the ligand salt was slowly cannula transferred into the precooled flask (10 min). After complete transfer (washed with 5 mL toluene), the reaction was maintained at −40° C. for 2 h and then allowed to warm to RT over one h. The reaction mixture was cannula transferred onto a pad of Celite® and filtered under Ar. The Celite pad was washed with toluene (2×10 mL), and the solvent volume was reduced in vacuo to 10 mL. Pentane (50 mL) was added, and the Schlenk flask was placed in a −30° C. freezer overnight. Solvent was removed from the precipitate via cannula filtration, and the residual solid was washed with pentane (3×5 mL). Drying in vacuo produced 150 mg (30%) of an orange solid. ¹H NMR (400 MHz, C₆D₆): δ 8.52 (dd, J=6.6, 1.6 Hz, 2 H); 7.32 (dd, J=8.0, 1.2 Hz, 2 H); 7.07 (m, 4 H); 6.76 (t, J=7.2 Hz, 2 H); 6.67 (m, 2 H); 6.47 (tt, J=7.6, 1.6 Hz, 1 H); 6.37 (d, J=11.5 Hz, 1 H); 6.27 (ddd, J=11.6, 8.8, 1.2 Hz, 1 H); 6.13 (t, J=9.4 Hz, 1 H); 6.07 (m, 2 H); 3.29 (sept, J=6.8 Hz, 2 H); 1.39 (d, J=6.8 Hz, 6 H); 1.10 (d, J=6.8 Hz, 6 H). ¹³C NMR (100 MHz, C₆D₆) δ 179.8, 170.5, 152.6, 152.2, 144.6, 142.7, 137.1, 136.0, 134.8, 132.8, 126.3, 125.1, 123.9, 123.3, 122.4, 122.1, 121.5, 120.5, 28.8, 25.5, 23.7.

EXAMPLE 84 Synthesis of (X)

To a flame dried Schlenk flask in a glovebox were added the sodium salt of 2-(2,6-di-i-propylanilino)tropone.THF (500 mg, 1.33 mmol) and (TMEDA)Ni(Ph)(Cl) (381 mg, 1.33 mmol). The flask was removed from the glovebox, was placed on a vacuum line under Ar, and was cooled with an ice water bath. Toluene (25 mL) and CH₃CN (1.5 mL) were added to the flask, which was removed from the ice water bath after 30 min. The reaction was allowed to stir at ambient temperature for 14.5 h. Initial cannula filtration of the solution was followed by cannula transfer onto a pad of Celite and filtration under Ar. The Celite® pad was washed with toluene (20 mL), and the solvent volume was reduced in vacuo to 5 mL. Pentane (50 mL) was added, and the Schlenk flask was placed in a −30° C. freezer overnight. Solvent was removed from the precipitate via cannula filtration, and the residual solid was washed with pentane (5 mL). Drying in vacuo produced 90 mg (11%) of a red-brown solid. ¹H NMR (400 MHz, C₆D₆): δ 7.21-7.29 (m, 6 H); 6.18-6.26 (m, 8 H); 5.92 (m, 2 H); 4.18 (sept, J=6.8 Hz, 4 H); 1.74 (d, J=6.8 Hz, 12 H); 1.19 (d, J=6.8 Hz, 12 H). 

1. A compound of the formula

wherein: R² is hydrocarbyl or substituted hydrocarbyl, provided that R² is attached to said nitrogen atom in (II) by a carbon atom that has at least 2 other atoms that are not hydrogen attached to it; and R³, R⁴, R⁵, R⁶ and R⁷ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group, provided that any two of R³, R⁴, R⁵, R⁶ and R⁷ vicinal to one another taken together may form a ring; L¹ is a monodentate monoanionic ligand and L² is a monodentate neutral ligand or an empty coordination site, or L¹ and L² taken together are a monoanionic bidentate ligand.
 2. The compound as recited in claim 1 wherein R² is

wherein R¹¹, R¹², R¹³, R¹⁴ and R¹⁵ are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl or a functional group, provided that any two of R¹¹, R¹², R¹³, R¹⁴ and R¹⁵ vicinal to one another taken together may form a ring.
 3. The compound as recited in claim 2 wherein R¹¹ and R¹⁵ are each independently chosen from the group consisting of alkyl containing 1 to 6 carbon atoms, perfluoroalkyl, alkoxy, phenyl and halo.
 4. The compound as recited in claim 3 wherein R¹², R¹³ and R¹⁴ are hydrogen. 